2007-08-012024-05-18https://scholars.lib.ntu.edu.tw/handle/123456789/713375摘要：本計畫將探討應用性頗廣的壓電陶瓷材料的高頻面內振動問題以及其所引發壓材料溫度驟升的情況，由於驅動壓電陶瓷材料的面內振動往往需應用相當大的電壓，且往往在高頻時作激發，使得壓電陶瓷材料處於高溫疲勞的環境中，而壓電陶瓷是屬於脆性材料，故在此高溫疲勞的環境中極易於裂紋的產生及擴展。而壓電陶瓷材料中的裂紋除了對於結構的安全及可靠度產生影響外，其佈於壓電陶瓷表面的電極也因裂紋而破壞其完整性，這對於壓電陶瓷材料振動特性的影響甚大，而此方面的研究亦少有相關文獻作深入之探討。而在壓電陶瓷材料兩邊鍍上電極以作激振的不同設計也將影響面內模態的動態特性。故本計畫亦將涵蓋電極設計對面內振動的影響探討。本研究計畫將整合且有系統地包含理論建立，數值計算以及實驗量測，針對壓電陶瓷材料板在不同電極設計所引發的面內振動及溫度變化作完整的探討，以便理論、數值及實驗能互相驗證。實驗主要以電子斑點干涉術的實驗方法對壓電材料板作全域性的面內振動模態以及共振頻率量測，並配合雷射都卜勒振動儀及阻抗分析的結果作深入之探討，以及應用溫度儀量測各不同共振頻率時之溫度變化。除此之外亦將應用有限元素數值計算作相關問題的理論研究並與實驗結果作比較。<br> Abstract: Because of the high frequency vibration will be introduced for the piezoceramic plate in in-plane resonant frequencies, the temperature in the specimen will increase rapidly with a short time period. The design of the electrode on the two surfaces of the piezoceramic plate will influence the dynamic characteristics of the piezoceramic plate and there is very few results available in the literature. The experimental measurement of resonant frequencies for the piezoceramic plate is generally performed by the impedance analysis. In this project, we employ an optical interferometry method called the amplitude-fluctuation electronic speckle pattern interferometry (AF-ESPI) to investigate the vibration characteristics of piezoceramic plates with different electrode design. As compared with the film recording and optical reconstruction procedures used for holographic interferometry, the interferometric fringes of AF-ESPI are produced instantly by a video recording system. Based on the fact that clear fringe patterns measured by the AF-ESPI method will be shown only at resonant frequencies, both the resonant frequencies and corresponding mode shapes are obtained experimentally at the same time. The influence of the electrode and temperature effect on the in-plane vibration in resonance of piezoceramic plates will be discussed in detail in this project. The numerical finite element calculations are also performed, and the results will be compared with the experimental measurements.電子斑點干涉術溫度壓電陶瓷板共振頻率模態ESPItemperaturepiezoceramic plateresonant frequencymode shape.